| Original Articles |
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Investigation of Amorphization of Nb-Si Alloys by Mechanical Alloying |
| LI Bing;MA Xueming;LIU Lin;QI Zhenzhong;DONG Yuanda* |
| Institute of Solid State Physics, Academia Sinica, Hefei 230031
*Department of Metallurgy and Materials, Shanghai University of Technology, Shanghai 200072
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| Cite this article: |
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LI Bing, MA Xueming, LIU Lin et al 1994 Chin. Phys. Lett. 11 681-684 |
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Abstract Amorphous Nb62.5Si37.5 and Nb75Si25 alloys were produced from mixtures of elemental Nb and Si powders by mechanical alloying (MA). The structural changes of mechanically alloyed powders were monitored by x-ray diffraction. It was found that NbSi2, intermetallic compound was formed in the initial stage of MA of or Nb62.5Si37.5 or Nb75Si25 powders. With continued milling, the mixtures of intermetallic NbSi2 and elemental Nb transformed into amorphous Nb-Si alloys (Nb62.5Si37.5 or Nb75Si25). The slow interdiffusion of Nb and Si and the slower diffusion of silicon atoms to niobium matrix than that of niobium atoms to silicon matrix were suggested to be responsible for the formation of intermetallic NbSi2. The amorphization of 3NbSi2 + 7Nb mixtures (or NbSi2 + 5Nb mixtures) is believed to be controlled by material transfer, which moves composition of line intermetallic NbSi2 off stoichiometry, and causes the matrix of elemental Nb deformed.
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| Keywords:
61.50.Ks
81.20.Ev
61.43.Dq
82.20.Mj
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Published: 01 November 1994
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| PACS: |
61.50.Ks
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(Crystallographic aspects of phase transformations; pressure effects)
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81.20.Ev
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(Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)
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61.43.Dq
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(Amorphous semiconductors, metals, and alloys)
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82.20.Mj
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